Grinding-machine.



w. c. BARNHART.

GRINDING MACHINE.

APPLICATION FILED MAR. a. 1915.

Patented Jan. 25, 1916.

WI TA/ESSES:

'TED STAS PATENT @FFlWE WALTER C. BARNHART. OF SEATTLE, WASHINGTON.

GRINDING-MACHINE.

Application filed March 8, 1915.

To all whom, it may concern:

Be it known that I, WALTER C. BARNHART, a citizen of the United States, residing at Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Grinding-Machines, of which the following is a specification.

This invention relates to improvements in grinding machines and, more particularly, to a machine of this class which is adapted for facing the peripheral faces of pulleys or wheels.

The object of my improvements is to produce an extremely efficient and conveniently operated pulley-grinding machine which will embody relatively few parts and which is capable of grinding a pulley without removing the same from its shaft and which will be frictionally operated through power applied through the agency of such shaft.

The invention consists in certain parts and details and combinations of the same, as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a perspective view of a grinding machine embodying the present invention assembled and ready for use. Fig. 2 is anend elevation of the machine, illustrated as applied to a pulley rim. Fig. 3 is a side elevation of the machine, looking toward the abrasive wheel. Fig. 4 is a detached view, partly in section and partly in elevation, of the abrasive Wheel and the holder therefor.

The reference numeral 5 designates a shaft to which a pulley Gwhich is to be faced is keyed, said shaft being journaled in standards, such as 7. The shaft 5 is rotated by power devices as, for example, a belt 8 passing about a driven pulley 9 upon the shaft.

10 represents a platform which may be a part of the support for the shaft standards or of framework immovable relatively thereto.

According to my invention, I provide a casting or bed plate 11 which is rigidly secured to the platform 10 and, as shown in Fig. 2, is provided with a longitudinal tongue 12 of an approximately dove-tail shape in cross-section.

Slidably mounted upon the bed-plate 11 is a carriage 13 having in its underside a dove-tail groove 14 to receive the tongue 12 of the bed-plate.

Depending from the carriage is anapertured projection 15 which is interiorly Specificationgf Letters Patent.

Patented J an. 25, 1916.

Serial No. 13,048.

screw-threaded to engage a feed-screw 16 which is journaled in a lug 17 of the bedplate and is manually actuated, preferably, by a crank handle 18. Said carriage is provided with a transversely arranged dove-tail groove 19 to accommodate a correspondingly-shaped tongue 20 formed on the underside of a block 21. This block has in its tongue 20 a screw-threaded hole, 20 for engagement with an adjustment screw 22 having a wheel-handle 23 and extends through a strap 24: secured to the carriage to afi'ord transverse feeding movements to the block with reference to said carriage.

25 represents a tool post provided with a head 25 at its lower end adapted to enter a groove 26 provided in the block. The tool post, like those commonly used with lathes, is formed with a slot 27. A set screw 28 extends into said slot for exercising a downward thrust upon the tool to cause a washer 30 therebelow to cooperate with the post head 25 to clamp the post to the block flanges 21 In this instance, two jaw members 29 and 29 are utilized in the post slot and are formed in'their opposing ,faces with grooves in which seats the shank 31 of the holder of the abrasive wheel 32. As shown, said holder is bifurcated at its forward end to furnish parallel branches 33 and 33 These branches are bored to receive a pin or shaft 341: upon which is journaled a sleeve 35. Saidsleeve is formed at one end with a. head 35 against which the abrasive wheel 32 is rigidly held by means of nuts 37 and 37 engaging screw threads provided on the sleeve.

38 and 38 represent nuts also engaging such screw-threads and are regulated to take up any end wear and have one of them bear against the holder branch 33 39 and 39 represent annular thrust plates interposed between the sleeve-head 35 and the holder branch 33 and are desirably made so that the alternate plates are of difierent metal as, for example, if the sleeve is constructed of brass, the plate 39 may be of steel and the other one 39 of brass.

34 represents a nut engaging screw threads at an end of the pin 34 and acts with the bolt-head 34 to maintain the bolt against axial displacement. The pin is provided with a duct 40 for a lubricant to flow from a grease cup ll at one end of the pin to the bearing of the sleeve 35.

The operation of the invention so far desame is rotated at a greater peripheral speed than the rimof wheel fiand inconsequ'enc'e scribed may-b e explained shank 31 of the holder for "jthe" abrasive wheel 32 is placed between theijaws 29and,-;,

29 within the slot of the tool-posts The holder is then turned about the axis of said shank to have the grinder, wheel" at an angle, say of about thirty-five deg'rees,"froin a vertical plane as indicated infFigi The set-screw 28 is then screwed-down? to raise the tool post and eflect the.clamping1-;

of the post to the blockand the-bindingof tangent to the circumferential surface to.

which the pulley 6 is to be faced =where upon the operator, by means ofcrank-handle 18, actuates the feed-sicrew' l fi to move the carriage so as to carry theabrasive'wheel transversely of the pul1ey6 to accomplish a j grinding efle'ct thereupon. "In such trans verse travel-of the abrasivewheel across 1 the face ofthe pulley 6, and reason of the inclination ,of the axis of the former, the

acts to grind the latter; The invention is of simple c not easily deranged, and may usedfto.

pulley without removing it- 3 linglthecarriagefonsaid'jbedrplate, anabra-v grind a wheel or from its shaft. I What I claim, i-

1. In a machin 'for grinding apulley; face, the combination of a rotary abrasive;- wheel, a holder therefor,a' carrier for said.

holder, means to afiord movements to said. carrier in directions parallel and rectangw lar to the axis of the pulley .tobe ground, andmeans for adjustably 'securing* sai'd' i holder to the carrier in selected rotary positions with respect to an axis extendingfdia-"i. metrically through said-wheel; whereby the rotation of saidflpulleyefiects the rotation], ofthe abrasive wheel at a peripheral speed greater than that of the pulley; 1 q,

a pulley face, the combination with a; pulley, andf j 2. In a. machine for grindin onstruc'tfion,

movable parallel to the-Iaxis of said pulley,

able rectangular to the flaxis of; the pulley, ga

whee, a holder-therefor, and means provided "in "said tool-post for" supporting said tool 0st carried bysaid block, an abrasive jholder-lin' predetermined"rotary-positions to r present said abrasivefiwhe'el- 'inpositions so that "the-latter will/be "rotated? through the instrumentality of the pulley at ai peripheral ispeed-diflerent from the peripheral speed of the latter to thereby cause the face ofthejpulleyftol beyground by the abrasive wheel' ,when-l-thef-*latter yismoved transversely.

Lthereofg 1 t {3.111 a machine for grinding the face'of a pulley, an abrasive wheel, a holder support-u jmg saidjwh'eel i for -rotative movements on [the wheelfajx'is, means for positioning'said j .tothe axis of the pulley, andmeans whereby the wheel is adapted tobe fed toward and wheel, to" haveits" axis inclined with respect parallel with the axis of the pulley and 'with-- .out yarying the inclination- .of the wheel axis with; respect to the p ulley.;

4t; In a*- machine --:for fgrinding" a pulley pulley to be ground, alcarriage mounted for travel on said bed-plate, means for propelsi've"wheel, a; shaft therefor, afholder-for said shaft,-means for securingsaid holder 78 I face, a .bed-plate,'-.adapted to. be securedgin 5 fixed relationwith respectjto the axi's 'of a' :to' the carriage whereby the shaft is rotated about anaxis intermediate its-ends to pre-- sent the wheel in skew relations to the pulley sov as to be rotated by frictional contact with to grindthe .p'ulley-face when the carriage is causedto travel through the agency of the said pulley and bedriven bythe latter so as .Sign'ed: at Seattle, iwa'sfh'iliigan; this am; f

a wALrERjQBARunA Tq 

